Who was the 'Appa' mentioned in Chapter 33 for whom Sai created a 'feast of sweet story-nectar'?

In Chapter 33, the author Hemadpant uses a beautiful metaphor, describing the stories of Sai Baba as a "feast of sweet story-nectar that Sai made for Appa's sake." While the text does not elaborate on a specific individual named Appa in this immediate context, it is a term of endearment, often for a father or an elder, and here it metaphorically represents the devoted reader for whom these sacred stories are prepared. Hemadpant extends this metaphor by stating that we, the readers, are "guest visitors" at this feast, able to partake as much as we want. He emphasizes that in this spiritual feast, unlike worldly life, everyone receives the same hospitality and can find satisfaction in the bliss of the self.